mnemoniacal 

Obsessed with remembering things, usually useless items of trivia.

mnemoniacal by woofa October 10, 2003

mnemonical 

mnemonical mne·mon·ic-cal (nĭ-mŏn'ĭk-kal)
adj.
A device, such as a formula, rhyme or sound, used as an aid in remembering or creativing an experience.

The chime from my microwave is a mnemonical cue that my plate of SpaghettiOs® is ready.

mnemonical by creativeblah July 22, 2010